EP 3647631 B1 20210616 - METHOD AND SYSTEM FOR GEAR ENGAGEMENT
Title (en)
METHOD AND SYSTEM FOR GEAR ENGAGEMENT
Title (de)
VERFAHREN UND SYSTEM ZUM EINLEGEN EINES GANGES
Title (fr)
PROCÉDÉ ET SYSTÈME D'ENCLENCHEMENT DE VITESSES
Publication
Application
Priority
EP 18203538 A 20181030
Abstract (en)
[origin: EP3647631A1] The present disclosure relates to a method for motion control of a shift sleeve in a stepped gear transmission during a synchronization and gear engagement sequence for avoiding gear teeth interference, wherein the stepped gear transmission comprises an axially displaceable shift sleeve arranged on and rotationally secured to a shaft, and a constant mesh gear wheel arranged on and rotatable relative to said shaft, the method comprising:receiving a gear shift command,determining a target relative displacement (y*_sg) between the sleeve teeth (22) and gear teeth (24) for a state when a gear wheel rotational speed (ω_g) reaches a shift sleeve rotational speed (ω_s) at an end of the synchronisation phase, which target relative displacement (y*_sg) is determined for avoiding impact between sleeve teeth and gear teeth during a following gear engagement phase,determining a first phase plane trajectory (y_sg1) defining a relationship between a rotational speed difference (ω_sg) between the shift sleeve and the gear wheel and a relative displacement (y_sg) between the sleeve teeth and gear teeth, wherein the relative displacement (y_sg) according to the first phase plane trajectory (y_sg1) equals the target relative displacement (y*_sg) when said rotational speed difference (ω_sg) becomes zero at the end of the synchronisation phase,determining a second phase plane trajectory (y_sg2) defining the relationship between the rotational speed difference (ω_sg) between the shift sleeve and the gear wheel and the relative displacement (y_sg) between the sleeve teeth and gear teeth, wherein the relative displacement (y_sg) according to the second phase plane trajectory (y_sg2) equals the target relative displacement (y*_sg) when said rotational speed difference (ω_sg) becomes zero at the end of the synchronisation phase,applying a synchronisation torque (T_synch), andcontrolling said synchronisation torque (T_synch) for keeping the real relative displacement (y_sgr) between the sleeve teeth (22) and gear teeth (24) within the boundaries of the first and second phase plane trajectories (y_sg1, y_sg2) for any rotational speed difference (ω_sg), such that the real relative displacement (y_sgr) between the sleeve teeth (22) and gear teeth (24) reaches said target relative displacement (y*_sg) simultaneously with said rotational speed difference (ω_sg) becomes zero at the end of the synchronisation phase.The present disclosure also relates to a corresponding control system.
IPC 8 full level
F16H 61/04 (2006.01)
CPC (source: EP US)
F16D 23/06 (2013.01 - US); F16H 61/04 (2013.01 - EP); F16D 2023/0618 (2013.01 - US); F16D 2023/0631 (2013.01 - US); F16D 2023/0656 (2013.01 - US); F16H 2061/0474 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3647631 A1 20200506; EP 3647631 B1 20210616; CN 112955680 A 20210611; CN 112955680 B 20221220; US 11434960 B2 20220906; US 2021239164 A1 20210805; WO 2020088405 A1 20200507
DOCDB simple family (application)
EP 18203538 A 20181030; CN 2019113690 W 20191028; CN 201980070868 A 20191028; US 202117227335 A 20210411